Academic citations provide a simple way to track this evolution.

ECONOMIST: Free exchange

If nature always stuck to simple plans, it would be easier to track the paths of evolution, but nature does not have that luxury.

NEWYORKER: It Ain��t Necessarily So

Speaking for the industry, Stuart Ingis, general counsel for the Digital Advertising Alliance, said the decision to adopt do-not-track is an "evolution" of the industry's approach.

WSJ: Web Companies Agree to Support 'Do Not Track' System

CIOs and CTOs should keep their eye on the evolution toward maturity of the public cloud and keep close track of the costs of the private cloud so that rational decisions can be made about where to provision specific types of applications and functionality.

FORBES: How CIOs and CTOs should Improve their Businesses with the Private Cloud

During this chaos, boat crew leaders are expected to keep track of their crews, maintain an accurate headcount, and still prep for the first evolution of Hell Week.

FORBES: From the Battlefield to the Boardroom: A Navy SEAL's Guide to Business Leadership Success (Part 2 of 3)

They track how unemployment has changed over time in the sample as a whole, and then they look at how its evolution differs across countries, according to how rigid their labour markets are.

ECONOMIST: A shocking error